message stringlengths 2 48.6k | message_type stringclasses 2
values | message_id int64 0 1 | conversation_id int64 318 108k | cluster float64 8 8 | __index_level_0__ int64 636 217k |
|---|---|---|---|---|---|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka is a figure of volume out_i with an empty space ... | instruction | 0 | 91,005 | 8 | 182,010 |
Tags: binary search, combinatorics, data structures, dp, shortest paths, sortings
Correct Solution:
```
import io, sys
input = lambda f=io.StringIO(sys.stdin.buffer.read().decode()).readline: f().rstrip()
from bisect import bisect_left as lb
MOD = 10 ** 9 + 7
n = int(input())
a = [tuple(map(int, input().split())) for... | output | 1 | 91,005 | 8 | 182,011 |
Provide tags and a correct Python 3 solution for this coding contest problem.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka is a figure of volume out_i with an empty space ... | instruction | 0 | 91,006 | 8 | 182,012 |
Tags: binary search, combinatorics, data structures, dp, shortest paths, sortings
Correct Solution:
```
import io, sys
input = lambda f=io.StringIO(sys.stdin.buffer.read().decode()).readline: f().rstrip()
from bisect import bisect_left as lb
MOD = 10 ** 9 + 7
n = int(input())
a = [tuple(map(int, input().split())) for... | output | 1 | 91,006 | 8 | 182,013 |
Provide tags and a correct Python 3 solution for this coding contest problem.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka is a figure of volume out_i with an empty space ... | instruction | 0 | 91,007 | 8 | 182,014 |
Tags: binary search, combinatorics, data structures, dp, shortest paths, sortings
Correct Solution:
```
mod = 1000000007
eps = 10**-9
def main():
import sys
input = sys.stdin.buffer.readline
N = int(input())
A = []
B = []
val = set()
val.add(0)
a_max = -1
for _ in range(N):
... | output | 1 | 91,007 | 8 | 182,015 |
Provide tags and a correct Python 3 solution for this coding contest problem.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka is a figure of volume out_i with an empty space ... | instruction | 0 | 91,008 | 8 | 182,016 |
Tags: binary search, combinatorics, data structures, dp, shortest paths, sortings
Correct Solution:
```
import sys
input = sys.stdin.readline
from bisect import bisect_right as br
P = 10**9+7
N = int(input())
X = []
maxinn = 0
for _ in range(N):
a, b = map(int, input().split())
maxinn = max(maxinn, b)
X.app... | output | 1 | 91,008 | 8 | 182,017 |
Provide tags and a correct Python 3 solution for this coding contest problem.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka is a figure of volume out_i with an empty space ... | instruction | 0 | 91,009 | 8 | 182,018 |
Tags: binary search, combinatorics, data structures, dp, shortest paths, sortings
Correct Solution:
```
from bisect import bisect_left as lb
MOD = 10 ** 9 + 7
n = int(input())
a = [tuple(map(int, input().split())) for _ in range(n)]
a = sorted((in_, out) for out, in_ in a)
dp_suf = [None] * n
for i in range(n - 1, ... | output | 1 | 91,009 | 8 | 182,019 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka i... | instruction | 0 | 91,010 | 8 | 182,020 |
No | output | 1 | 91,010 | 8 | 182,021 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka i... | instruction | 0 | 91,011 | 8 | 182,022 |
No | output | 1 | 91,011 | 8 | 182,023 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka i... | instruction | 0 | 91,012 | 8 | 182,024 |
No | output | 1 | 91,012 | 8 | 182,025 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
There are famous Russian nesting dolls named matryoshkas sold in one of the souvenir stores nearby, and you'd like to buy several of them. The store has n different matryoshkas. Any matryoshka i... | instruction | 0 | 91,013 | 8 | 182,026 |
No | output | 1 | 91,013 | 8 | 182,027 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,241 | 8 | 182,482 |
Tags: greedy, sortings
Correct Solution:
```
def validate_stack(stack):
for i in range(len(stack)):
if stack[i] < len(stack)-i-1:
return False
return True
# print(validate_stack([4,4,4,4,4]))
if __name__ == '__main__':
n = int(input())
box_strength = [int(x) for x in input().split()]
box_strength = sorted(box... | output | 1 | 91,241 | 8 | 182,483 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,242 | 8 | 182,484 |
Tags: greedy, sortings
Correct Solution:
```
def go():
n = int(input())
a = [int(i) for i in input().split(' ')]
a.sort()
o = 1
for i in range(n):
if(a[i] < i // o):
o += 1
return o
print(go())
``` | output | 1 | 91,242 | 8 | 182,485 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,243 | 8 | 182,486 |
Tags: greedy, sortings
Correct Solution:
```
import bisect
n = int(input())
xi = list(sorted(map(int, input().split())))
s = set(xi)
li = []
while len(xi) > 0:
li.append([xi.pop(0)])
i = 0
while i < len(xi):
if xi[i] >= len(li[-1]):
li[-1].append(xi.pop(i))
else:
i +=... | output | 1 | 91,243 | 8 | 182,487 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,244 | 8 | 182,488 |
Tags: greedy, sortings
Correct Solution:
```
import math
class CodeforcesTask388ASolution:
def __init__(self):
self.result = ''
self.n = 0
self.boxes = []
def read_input(self):
self.n = int(input())
self.boxes = [int(x) for x in input().split(" ")]
def process_tas... | output | 1 | 91,244 | 8 | 182,489 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,245 | 8 | 182,490 |
Tags: greedy, sortings
Correct Solution:
```
n=int(input())
x=list(map(int,input().split()))
x.sort()
nu=0
ans=0
mark=[]
for i in range(0,n):
mark.append(0)
for i in range(0,n):
fail=1
nu=0
for j in range(0,n):
if mark[j] == 0:
fail = 0
if x[j] >= nu:
... | output | 1 | 91,245 | 8 | 182,491 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,246 | 8 | 182,492 |
Tags: greedy, sortings
Correct Solution:
```
n = int(input())
a = [int(i) for i in input().split(' ')]
a.sort()
s = 1
for i in range(n):
if(a[i] < i // s):
s += 1
print(s)
``` | output | 1 | 91,246 | 8 | 182,493 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,247 | 8 | 182,494 |
Tags: greedy, sortings
Correct Solution:
```
n=int(input())
l=list(map(int,input().split()))
l=sorted(l)
l=l[::-1]
l1=[0]*n
k=0
for i in range(n) :
if l1[i]!=1 :
t=l[i]
p=1
r=0
l1[i]==1
V=[t]
for j in range(n) :
if l1[j]==0 and l[j]<t :
t=l... | output | 1 | 91,247 | 8 | 182,495 |
Provide tags and a correct Python 3 solution for this coding contest problem.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the box).
Since all the boxes have the same size... | instruction | 0 | 91,248 | 8 | 182,496 |
Tags: greedy, sortings
Correct Solution:
```
N = int(input())
ar = list(map(int, input().split()))
ar.sort()
a = 1
b = 100
while a < b:
compliant = True
k = (a+b) // 2
for i in range(len(ar)):
if ar[i] < (i//k):
compliant = False
break
if compliant:
b = k
else:
a = k + 1
print(b)
`... | output | 1 | 91,248 | 8 | 182,497 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,249 | 8 | 182,498 |
Yes | output | 1 | 91,249 | 8 | 182,499 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,250 | 8 | 182,500 |
Yes | output | 1 | 91,250 | 8 | 182,501 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,251 | 8 | 182,502 |
Yes | output | 1 | 91,251 | 8 | 182,503 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,252 | 8 | 182,504 |
Yes | output | 1 | 91,252 | 8 | 182,505 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,253 | 8 | 182,506 |
No | output | 1 | 91,253 | 8 | 182,507 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,254 | 8 | 182,508 |
No | output | 1 | 91,254 | 8 | 182,509 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,255 | 8 | 182,510 |
No | output | 1 | 91,255 | 8 | 182,511 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Fox Ciel has n boxes in her room. They have the same size and weight, but they might have different strength. The i-th box can hold at most xi boxes on its top (we'll call xi the strength of the... | instruction | 0 | 91,256 | 8 | 182,512 |
No | output | 1 | 91,256 | 8 | 182,513 |
Provide tags and a correct Python 2 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,257 | 8 | 182,514 |
Tags: dp, implementation
Correct Solution:
```
from sys import stdin, stdout
from collections import Counter, defaultdict
from itertools import permutations, combinations
raw_input = stdin.readline
pr = stdout.write
def in_arr():
return map(int,raw_input().split())
def pr_num(n):
stdout.write(str(n)+'\n')
... | output | 1 | 91,257 | 8 | 182,515 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,258 | 8 | 182,516 |
Tags: dp, implementation
Correct Solution:
```
R = lambda: map(int, input().split())
n = int(input())
mod = 1000000007
arr = [x - 1 for x in R()]
dp = [0] * (n + 1)
sdp = [0] * (n + 1)
dp[0] = sdp[0] = 2
for i in range(1, len(arr)):
dp[i] = (2 + sdp[i - 1] - sdp[arr[i] - 1]) % mod
sdp[i] = (sdp[i - 1] + dp[i]) ... | output | 1 | 91,258 | 8 | 182,517 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,259 | 8 | 182,518 |
Tags: dp, implementation
Correct Solution:
```
n = int(input())
a = list(map(int, input().split()))
dp = [0 for i in range(n+1)]
for i in range(n+1):
if i > 0 : dp[i] = (2*dp[i-1]+2-dp[a[i-1]-1])%1000000007
print((dp[n]+1000000007)%1000000007)
``` | output | 1 | 91,259 | 8 | 182,519 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,260 | 8 | 182,520 |
Tags: dp, implementation
Correct Solution:
```
import sys
MOD = 10 ** 9 + 7
N = int(input())
bs = [int(b) - 1 for b in input().split()]
fs = [0]
for i in range(1,N+1):
f = 2 * fs[i - 1] + 2 - fs[bs[i - 1]]
fs.append(f % MOD)
print(fs[-1])
``` | output | 1 | 91,260 | 8 | 182,521 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,261 | 8 | 182,522 |
Tags: dp, implementation
Correct Solution:
```
z = int(input())
l = [None] + [int(x) for x in input().split()]
pt = [0] * (z + 2)
for i in range(1, z + 1):
pt[i + 1] = (2 * pt[i] - pt[l[i]] + 2) % 1000000007
print(pt[z + 1] % 1000000007)
``` | output | 1 | 91,261 | 8 | 182,523 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,262 | 8 | 182,524 |
Tags: dp, implementation
Correct Solution:
```
n=int(input())
p=list(map(int,input().split(" ",n)[:n]))
a=[i+1 for i in range(n)]
dp1=[0]*(n+1)
dp1[1]=2
dp2=[0]*(n+1)
dp2[1]=2
mod=10**9 + 7
for i in range(2,n+1):
k=p[i-1]
an=2
for j in range(k,i):
an+=dp2[j]%mod
dp2[i]=an%mod
dp1[i]=dp2[i]+d... | output | 1 | 91,262 | 8 | 182,525 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,263 | 8 | 182,526 |
Tags: dp, implementation
Correct Solution:
```
input()
dp = [0]
[dp.append((2 * dp[-1] + 2 - dp[u - 1]) % 1000000007) for u in map(int, input().split())]
print (dp[-1])
``` | output | 1 | 91,263 | 8 | 182,527 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,264 | 8 | 182,528 |
Tags: dp, implementation
Correct Solution:
```
n,a= int(input()),list(map(int,input().split()))
f,m= [0]*(n+1),10**9+7
for i in range(n):
if a[i]==i+1:
f[i+1]=f[i]+2
else:
f[i+1]=(2+f[i]*2-f[a[i]-1])%m
print(f[n]%m)
``` | output | 1 | 91,264 | 8 | 182,529 |
Provide tags and a correct Python 3 solution for this coding contest problem.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n + 1)-th one.
The maze is organized as follows... | instruction | 0 | 91,265 | 8 | 182,530 |
Tags: dp, implementation
Correct Solution:
```
def bf(n, portal2):
portal2.insert(0, -1)
roomMark = [False]*(n+1)
markCount = 0
room = 1
while(room != n+1):
markCount += 1
roomMark[room] = not roomMark[room]
if roomMark[room]:
room = portal2[room]
else:
room += 1
print(markCount % 1000000007)
... | output | 1 | 91,265 | 8 | 182,531 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,266 | 8 | 182,532 |
Yes | output | 1 | 91,266 | 8 | 182,533 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,267 | 8 | 182,534 |
Yes | output | 1 | 91,267 | 8 | 182,535 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,268 | 8 | 182,536 |
Yes | output | 1 | 91,268 | 8 | 182,537 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,269 | 8 | 182,538 |
Yes | output | 1 | 91,269 | 8 | 182,539 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,270 | 8 | 182,540 |
No | output | 1 | 91,270 | 8 | 182,541 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,271 | 8 | 182,542 |
No | output | 1 | 91,271 | 8 | 182,543 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,272 | 8 | 182,544 |
No | output | 1 | 91,272 | 8 | 182,545 |
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,273 | 8 | 182,546 |
No | output | 1 | 91,273 | 8 | 182,547 |
Evaluate the correctness of the submitted Python 2 solution to the coding contest problem. Provide a "Yes" or "No" response.
One day, little Vasya found himself in a maze consisting of (n + 1) rooms, numbered from 1 to (n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the (n... | instruction | 0 | 91,274 | 8 | 182,548 |
No | output | 1 | 91,274 | 8 | 182,549 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,563 | 8 | 183,126 |
"Correct Solution:
```
n = int(input())
a = [int(input()) for i in range(n)]
x = 1
i = 0
while i < n and x != 2:
x = a[x-1]
i += 1
if x == 2:
print(i)
else:
print(-1)
``` | output | 1 | 91,563 | 8 | 183,127 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,564 | 8 | 183,128 |
"Correct Solution:
```
N=int(input())
a=[int(input()) for i in range(N)]
x=1
for i in range(N):
if(x==2):
print(i)
exit()
x=a[x-1]
print("-1")
``` | output | 1 | 91,564 | 8 | 183,129 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,565 | 8 | 183,130 |
"Correct Solution:
```
n=int(input())
a=[0]*(n+1)
for i in range(n):
a[i]=int(input())
k=0
ans=-1
for i in range(n):
# print(k)
k=a[k]-1
if(k==1):
ans=i+1
break
print(ans)
``` | output | 1 | 91,565 | 8 | 183,131 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,566 | 8 | 183,132 |
"Correct Solution:
```
n=int(input())
a=[int(input()) for i in range(n)]
count=1
for i in range(n):
if count == 2:
print(i)
exit()
count=a[count-1]
print(-1)
``` | output | 1 | 91,566 | 8 | 183,133 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,567 | 8 | 183,134 |
"Correct Solution:
```
n=int(input())
a=[int(input())-1 for _ in range(n)]
i=0
ct=0
while i!=1:
if a[i]==-1:
print("-1")
break
k=i
i=a[i]
a[k]=-1
ct+=1
else:
print(ct)
``` | output | 1 | 91,567 | 8 | 183,135 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,568 | 8 | 183,136 |
"Correct Solution:
```
n=int(input())
l=[int(input()) for i in range(n)]
count=0
for i in range(n):
if l[count]==2:
print(i+1)
exit()
else:
count=l[count]-1
print(-1)
``` | output | 1 | 91,568 | 8 | 183,137 |
Provide a correct Python 3 solution for this coding contest problem.
Takahashi wants to gain muscle, and decides to work out at AtCoder Gym.
The exercise machine at the gym has N buttons, and exactly one of the buttons is lighten up. These buttons are numbered 1 through N. When Button i is lighten up and you press it... | instruction | 0 | 91,569 | 8 | 183,138 |
"Correct Solution:
```
n,ans=int(input()),-1
a,m=[int(input())for i in range(n)],1
for i in range(n):
m=a[m-1]
if m==2:
ans=i+1
break
print(ans)
``` | output | 1 | 91,569 | 8 | 183,139 |
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